linux-kernel - RE: [PATCH v5 11/16] asm-generic/hyperv: update hv_msi

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Date:   Tue, 26 Jan 2021 01:22:09 +0000
From:   Michael Kelley <mikelley@...rosoft.com>
To:     Wei Liu <wei.liu@...nel.org>,
        Linux on Hyper-V List <linux-hyperv@...r.kernel.org>
CC:     "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>,
        Linux Kernel List <linux-kernel@...r.kernel.org>,
        Vineeth Pillai <viremana@...ux.microsoft.com>,
        Sunil Muthuswamy <sunilmut@...rosoft.com>,
        Nuno Das Neves <nunodasneves@...ux.microsoft.com>,
        "pasha.tatashin@...een.com" <pasha.tatashin@...een.com>,
        KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>, Arnd Bergmann <arnd@...db.de>,
        "open list:GENERIC INCLUDE/ASM HEADER FILES" 
        <linux-arch@...r.kernel.org>
Subject: RE: [PATCH v5 11/16] asm-generic/hyperv: update hv_msi_entry

From: Wei Liu <wei.liu@...nel.org> Sent: Wednesday, January 20, 2021 4:01 AM
> 
> We will soon need to access fields inside the MSI address and MSI data
> fields. Introduce hv_msi_address_register and hv_msi_data_register.
> 
> Fix up one user of hv_msi_entry in mshyperv.h.
> 
> No functional change expected.
> 
> Signed-off-by: Wei Liu <wei.liu@...nel.org>
> ---
>  arch/x86/include/asm/mshyperv.h   |  4 ++--
>  include/asm-generic/hyperv-tlfs.h | 28 ++++++++++++++++++++++++++--
>  2 files changed, 28 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h
> index 4e590a167160..cbee72550a12 100644
> --- a/arch/x86/include/asm/mshyperv.h
> +++ b/arch/x86/include/asm/mshyperv.h
> @@ -257,8 +257,8 @@ static inline void hv_apic_init(void) {}
>  static inline void hv_set_msi_entry_from_desc(union hv_msi_entry *msi_entry,
>  					      struct msi_desc *msi_desc)
>  {
> -	msi_entry->address = msi_desc->msg.address_lo;
> -	msi_entry->data = msi_desc->msg.data;
> +	msi_entry->address.as_uint32 = msi_desc->msg.address_lo;
> +	msi_entry->data.as_uint32 = msi_desc->msg.data;
>  }
> 
>  #else /* CONFIG_HYPERV */
> diff --git a/include/asm-generic/hyperv-tlfs.h b/include/asm-generic/hyperv-tlfs.h
> index ec53570102f0..7e103be42799 100644
> --- a/include/asm-generic/hyperv-tlfs.h
> +++ b/include/asm-generic/hyperv-tlfs.h
> @@ -480,12 +480,36 @@ struct hv_create_vp {
>  	u64 flags;
>  } __packed;
> 
> +union hv_msi_address_register {
> +	u32 as_uint32;
> +	struct {
> +		u32 reserved1:2;
> +		u32 destination_mode:1;
> +		u32 redirection_hint:1;
> +		u32 reserved2:8;
> +		u32 destination_id:8;
> +		u32 msi_base:12;
> +	};
> +} __packed;
> +
> +union hv_msi_data_register {
> +	u32 as_uint32;
> +	struct {
> +		u32 vector:8;
> +		u32 delivery_mode:3;
> +		u32 reserved1:3;
> +		u32 level_assert:1;
> +		u32 trigger_mode:1;
> +		u32 reserved2:16;
> +	};
> +} __packed;
> +
>  /* HvRetargetDeviceInterrupt hypercall */
>  union hv_msi_entry {
>  	u64 as_uint64;
>  	struct {
> -		u32 address;
> -		u32 data;
> +		union hv_msi_address_register address;
> +		union hv_msi_data_register data;
>  	} __packed;
>  };
> 
> --
> 2.20.1

Reviewed-by: Michael Kelley <mikelley@...rosoft.com>